As it certainly wasnt your fault then get his insurance to sort it all out,but then again you need to be careful as even thoufgh it wasnt your fault,if you have any repairs done by an insurance claim you could end up paying more yourself even though it wasnt your fault.Happened to my sister,someone hit her rear end and the car was repaired through the others insurers but then when she came to re-new her insurance it had gone up because of the claim even though it wasnt her fault.Insurance is a big con really and i can see why people dont bother,although i certainly dont condone it.They shaft you if you claim,shaft you if you dont